Subject: [PATCH] Prevent duplicate lmb reservations for Device Tree blob.

From: Jon Loeliger <[email-masked]>
Date: Sat, 17 Jun 2006 17:51:09 -0500

Signed-off-by: Jon Loeliger <[email-masked]>

---
We talked about preventing the device tree blob from being
reserved multiple times.   This patch implements it.

 arch/powerpc/kernel/prom.c |   13 +++++++++++--
 1 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index d77d24a..6290232 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -1267,13 +1267,16 @@ static void __init early_reserve_mem(voi
 {
 	u64 base, size;
 	u64 *reserve_map;
+	unsigned long self_base;
+	unsigned long self_size;
 
 	reserve_map = (u64 *)(((unsigned long)initial_boot_params) +
 					initial_boot_params->off_mem_rsvmap);
 
 	/* before we do anything, lets reserve the dt blob */
-	lmb_reserve(__pa((unsigned long)initial_boot_params),
-		    initial_boot_params->totalsize);
+	self_base = __pa((unsigned long)initial_boot_params);
+	self_size = initial_boot_params->totalsize;
+	lmb_reserve(self_base, self_size);
 
 #ifdef CONFIG_PPC32
 	/* 
@@ -1289,6 +1292,9 @@ #ifdef CONFIG_PPC32
 			size_32 = *(reserve_map_32++);
 			if (size_32 == 0)
 				break;
+			/* skip if the reservation is for the blob */
+			if (base_32 == self_base && size_32 == self_size)
+				continue;
 			DBG("reserving: %x -> %x\n", base_32, size_32);
 			lmb_reserve(base_32, size_32);
 		}
@@ -1300,6 +1306,9 @@ #endif
 		size = *(reserve_map++);
 		if (size == 0)
 			break;
+		/* skip if the reservation is for the blob */
+		if (base == self_base && size == self_size)
+			continue;
 		DBG("reserving: %llx -> %llx\n", base, size);
 		lmb_reserve(base, size);
 	}